The idea of Bhagavad Gita is not that we should be utterly unconcerned about the results of our actions and Krishna is telling is that we should not think of ourselves as the doers of the job, in terms of being the producer of the result of the job.
Here is what Swami Vivekananda said in a lecture:
This world’s wheel within wheel is a terrible mechanism; if we put our hands in it, as soon as we are caught we are gone. We all think that when we have done a certain duty, we shall be at rest; but before we have done a part of that duty, another is already in waiting. We are all being dragged along by this mighty, complex world-machine.
There are only two ways out of it;
- one is to give up all concerns with the machine, to let it go and stand aside, to give up our desires. That is very easy to say, but is almost impossible to do.
I do not know whether in twenty millions of men one can do that.
- The other way is to plunge into the world and learn the secret of work, and that is the way of Karma-Yoga. Do not fly away from the wheels of the world-machine, but stand inside it and learn the secret of work. Through proper work done inside, it is also possible to come out. Through this machinery itself is the way out.
We have now seen what work is. It is a part of natures foundation, and goes on always. Those that believe in God understand this better, because they know that God is not such an incapable being as will need our help. Although this universe will go on always, our goal is freedom, our goal is unselfishness; and according to Karma-Yoga, that goal is to be reached through work.
All ideas of making the world perfectly happy may be good as motive powers for fanatics;
but we must know that fanaticism brings forth as much evil as good.
The Karma-Yogi asks why you require any motive to work other than the inborn love of freedom. Be beyond the common worldly motives. “To work you have the right, but not to the fruits thereof.” Man can train himself to know and to practice that, says the Karma-Yogi. When the idea of doing good becomes a part of his very being, then he will not seek for any motive outside. Let us do good because it is good to do good; he who does good work even in order to get to heaven binds himself down, says the Karma-Yogi. Any work that is done with any the least selfish motive, instead of making us free, forges one more chain for our feet. So the only way is to give up all the fruits of work, to be unattached to them.
Know that this world is not we, nor are we this world; that we are really not the body; that we really do not work. We are the Self, eternally at rest and at peace. Why should we be bound by anything?
It is very good to say that we should be perfectly non-attached, but what is the way to do it? Every good work we do without any ulterior motive, instead of forging a new chain, will break one of the links in the existing chains. Every good thought that we send to the world without thinking of any return, will be stored up there and break one link in the chain, and make us purer and purer, until we become the purest of mortals. Yet all this may seem to be rather quixotic and too philosophical, more theoretical than practical. I have read many arguments against the Bhagavad-Gita, and many have said that without motives you cannot work. They have never seen unselfish work except under the influence of fanaticism, and, therefore, they speak in that way.
Let me tell you in conclusion a few words about one man who actually carried this teaching of Karma-Yoga into practice. That man is Buddha. He is the one man who ever carried this into perfect practice.
All the prophets of the world, except Buddha, had external motives to move them to unselfish action. The prophets of the world, with this single exception, may be divided into two sets, one set holding that they are incarnations of God come down on earth, and the other holding that they are only messengers from God; and both draw their impetus for work from outside, expect reward from outside, however highly spiritual may be the language they use. But Buddha is the only prophet who said, “I do not care to know your various theories about God.
What is the use of discussing all the subtle doctrines about the soul? Do good and be good. And this will take you to freedom and to whatever truth there is.” He was, in the conduct of his life, absolutely without personal motives; and what man worked more than he? Show me in history one character who has soared so high above all. The whole human race has produced but one such character, such high philosophy, such wide sympathy. This great philosopher, preaching the highest philosophy, yet had the deepest sympathy for the lowest of animals, and never put forth any claims for himself. He is the ideal Karma-Yogi, acting entirely without motive, and the history of humanity shows him to have been the greatest man ever born; beyond compare the greatest combination of heart and brain that ever existed, the greatest soul-power that has even been manifested. He is the first great reformer the world has seen. He was the first who dared to say,
“Believe not because some old manuscripts are produced, believe not because it is your national belief, because you have been made to believe it from your childhood; but reason it all out, and after you have analysed it, then, if you find that it will do good to one and all, believe it, live up to it, and help others to live up to it.”
He works best who works without any motive, neither for money, nor for fame, nor for anything else; and when a man can do that, he will be a Buddha, and out of him will come the power to work in such a manner as will transform the world. This man represents the very highest ideal of Karma-Yoga.
~ Swami Vivekananda
read more from here and other lectures on Karma Yoga:
The Complete Works of Swami Vivekananda/Volume 1/Karma-Yoga/The Ideal of Karma-Yoga
Sodarshan Chakra Kriya 